Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A pixel circuit, comprising: a driving transistor; and a touch circuit configured to cause a voltage change when a touch operation happens and coupled to a data line through a writing compensation circuit, wherein the writing compensation circuit includes a storage capacitor, is configured to compensate a threshold voltage of the driving transistor, and to allow the voltage change to be read out through the data line, the writing compensation circuit further includes a pulling-down sub-circuit for pulling down the voltage of a second terminal of the storage capacitor, and the pulling-down sub- circuit includes a pulling-down switch transistor; a first terminal of the pulling-down switch transistor is connected to a pulling-down voltage source; a second terminal of the pulling-down switch transistor is connected to the second terminal of the storage capacitor; and a control gate terminal of the pulling-down switch transistor is connected to a pulling-down control line.
This invention relates to a pixel circuit for display panels with integrated touch sensing capabilities. The circuit addresses the challenge of integrating touch functionality into display pixels while maintaining accurate display performance, particularly compensating for threshold voltage variations in the driving transistor that can degrade image quality. The pixel circuit includes a driving transistor and a touch circuit that detects voltage changes during touch operations. The touch circuit is connected to a data line through a writing compensation circuit, which compensates for the driving transistor's threshold voltage to ensure consistent display performance. The compensation circuit includes a storage capacitor that stores voltage data and a pulling-down sub-circuit that resets the capacitor's voltage to a stable state. The pulling-down sub-circuit consists of a switch transistor connected to a pulling-down voltage source, the storage capacitor, and a control line that activates the reset function. This design allows the touch-induced voltage changes to be accurately read through the data line while maintaining display accuracy. The integrated touch and display functionality simplifies panel design and improves manufacturing efficiency.
2. The pixel circuit according to claim 1 , wherein the writing compensation circuit further includes: a pulling-up sub-circuit for pulling up the voltage of a first terminal of the storage capacitor, and a connecting sub-circuit for allowing the voltage of the first terminal of the storage capacitor to be applied to a control gate of the driving transistor.
This invention relates to pixel circuits for display devices, particularly addressing voltage compensation in organic light-emitting diode (OLED) displays. The problem being solved is the degradation of display performance due to threshold voltage shifts in driving transistors over time, which leads to uneven brightness and reduced image quality. The pixel circuit includes a writing compensation circuit designed to mitigate these issues. The compensation circuit comprises a pulling-up sub-circuit that increases the voltage at a first terminal of a storage capacitor. This sub-circuit ensures that the voltage level is sufficient to counteract threshold voltage variations in the driving transistor. Additionally, a connecting sub-circuit is included to apply the voltage from the first terminal of the storage capacitor to the control gate of the driving transistor. This direct application helps stabilize the driving current, ensuring consistent brightness across the display. The storage capacitor stores the data voltage during the writing phase, and the compensation circuit adjusts this voltage to compensate for any threshold voltage shifts in the driving transistor. By dynamically adjusting the voltage applied to the control gate, the circuit maintains accurate current control, improving display uniformity and longevity. This solution is particularly useful in active-matrix OLED (AMOLED) displays where threshold voltage variations are a significant challenge.
3. The pixel circuit according to claim 2 , wherein: the pulling-up sub-circuit includes a pulling-up switch transistor; a first terminal of the pulling-up switch transistor is connected to a pulling-up voltage source; a second terminal of the pulling-up switch transistor is connected to the first terminal of the storage capacitor; and a control gate terminal of the pulling-up switch transistor is connected to a pulling-up control line.
A pixel circuit for display devices, particularly organic light-emitting diode (OLED) displays, addresses the challenge of achieving stable and efficient pixel driving. The circuit includes a pulling-up sub-circuit designed to control the voltage applied to a storage capacitor, which stores data signals for driving the pixel. The pulling-up sub-circuit comprises a pulling-up switch transistor with a first terminal connected to a pulling-up voltage source, a second terminal connected to the first terminal of the storage capacitor, and a control gate terminal connected to a pulling-up control line. This configuration allows precise control of the voltage supplied to the storage capacitor, ensuring accurate data signal storage and stable pixel operation. The pulling-up voltage source provides the necessary voltage level, while the pulling-up control line activates the switch transistor to enable or disable the voltage supply. This design enhances the circuit's ability to maintain consistent brightness and reduce power consumption in display applications. The pulling-up sub-circuit works in conjunction with other components, such as a driving transistor and a light-emitting element, to achieve reliable pixel performance. The overall circuit improves display uniformity and efficiency by ensuring accurate voltage control during pixel operation.
4. The pixel circuit according to claim 2 , wherein: the driving transistor further includes a first terminal being connected to a driving voltage source for driving the light emitting module.
A pixel circuit for display devices, particularly for organic light-emitting diode (OLED) displays, addresses the challenge of achieving stable and efficient light emission by controlling the current flow through a light-emitting module. The circuit includes a driving transistor that regulates the current supplied to the light-emitting module, ensuring consistent brightness and longevity. The driving transistor has a first terminal connected to a driving voltage source, which provides the necessary electrical power to drive the light-emitting module. This connection enables precise control over the current, allowing for accurate and uniform light emission across the display. The circuit may also include additional components, such as switching transistors and storage capacitors, to manage the voltage and current levels, ensuring reliable operation under varying conditions. By optimizing the driving transistor's connection to the voltage source, the pixel circuit enhances the overall performance and efficiency of the display, reducing power consumption and improving image quality. This design is particularly useful in high-resolution and large-area displays where maintaining uniform brightness and minimizing power usage are critical.
5. The pixel circuit according to claim 1 , wherein: the touch circuit includes a touch sensing element and a touch switch transistor; and the touch switch transistor includes a first terminal being connected to the first terminal of the storage capacitor, a second terminal being connected to a first terminal of the touch sensing element, and a control gate terminal being connected to a touch sensing control line.
This invention relates to pixel circuits for display panels with integrated touch sensing capabilities. The problem addressed is the need for efficient touch detection in active-matrix display systems without compromising display performance. The pixel circuit includes a touch circuit with a touch sensing element and a touch switch transistor. The touch switch transistor has a first terminal connected to the first terminal of a storage capacitor, a second terminal connected to a first terminal of the touch sensing element, and a control gate terminal connected to a touch sensing control line. The storage capacitor is part of the pixel circuit and is used to store voltage data for display purposes. The touch sensing element detects touch inputs by measuring changes in capacitance or other electrical properties when a user interacts with the display. The touch switch transistor controls the connection between the storage capacitor and the touch sensing element, allowing touch sensing operations to be performed without interfering with the display function. The touch sensing control line activates or deactivates the touch switch transistor to enable touch sensing at specific times, ensuring that touch detection does not disrupt the normal display operation. This design integrates touch sensing directly into the pixel circuit, reducing the need for additional layers or components, and improving the efficiency and accuracy of touch detection in display panels.
6. The pixel circuit according to claim 5 , wherein: the touch sensing element is a variable capacitor; and a second terminal of the variable capacitor is floating.
A pixel circuit for display and touch sensing applications includes a touch sensing element implemented as a variable capacitor. The variable capacitor has a first terminal connected to a touch sensing line and a second terminal that is left floating. This configuration allows the pixel circuit to detect touch inputs by measuring changes in capacitance when a user interacts with the display surface. The floating second terminal of the variable capacitor enhances sensitivity by reducing parasitic capacitance effects, improving signal-to-noise ratio during touch detection. The pixel circuit integrates touch sensing functionality without requiring additional dedicated touch electrodes, optimizing space and manufacturing efficiency. The variable capacitor's capacitance changes in response to touch, enabling precise detection of touch location and pressure. This design is particularly useful in capacitive touchscreens, where accurate and reliable touch sensing is critical for user interaction. The floating terminal configuration minimizes interference from adjacent components, ensuring accurate touch data acquisition. The pixel circuit may also include additional elements such as transistors and storage capacitors to support display functions, but the touch sensing element operates independently to provide simultaneous display and touch capabilities. This approach simplifies the overall system architecture while maintaining high performance in both display and touch sensing operations.
7. The pixel circuit according to claim 5 , wherein: the touch sensing element is a photosensitive diode; and a first terminal of the photosensitive diode is connected to a terminal with low potential.
A pixel circuit for display and touch sensing applications includes a touch sensing element integrated with a display pixel to detect touch inputs while maintaining display functionality. The circuit addresses the challenge of integrating touch sensing without compromising display performance or increasing complexity. The touch sensing element is a photosensitive diode, which converts light into an electrical signal when touched, enabling touch detection. A first terminal of the photosensitive diode is connected to a terminal with low potential, ensuring proper biasing and signal stability. The circuit also includes a driving transistor for controlling the pixel's light emission, a storage capacitor for maintaining voltage levels, and a switching transistor for resetting or reading signals. The photosensitive diode's integration allows for simultaneous display and touch sensing, improving user interaction without additional layers or components. The low-potential connection ensures efficient signal processing and reduces noise, enhancing touch accuracy. This design is particularly useful in high-resolution displays where space and performance are critical.
8. The pixel circuit according to claim 1 , wherein: the pixel circuit further includes a first data connecting switch transistor; and the data connecting switch transistor includes a first terminal being connected to the data line, a second terminal being connected to the control gate terminal of the driving transistor, and a control gate terminal being connected to a first data connecting control line.
This invention relates to pixel circuits used in display technologies, particularly for controlling the operation of driving transistors within each pixel. The problem addressed is the need for precise and efficient data transfer to the driving transistor in a pixel circuit, which is critical for accurate image display in devices like OLED displays. The pixel circuit includes a driving transistor that controls the current flow to a light-emitting element, such as an OLED, based on a data signal. To enhance control over this data transfer, the circuit incorporates a first data connecting switch transistor. This switch transistor has a first terminal connected to a data line, a second terminal connected to the control gate terminal of the driving transistor, and a control gate terminal connected to a first data connecting control line. The switch transistor acts as a gate to regulate when and how the data signal from the data line is applied to the driving transistor's control gate, ensuring precise voltage or current levels are delivered to the driving transistor. This improves the accuracy of the pixel's light emission, reducing inconsistencies in brightness and color across the display. The inclusion of this switch transistor allows for better synchronization between data signals and pixel activation, enhancing overall display performance. The design is particularly useful in active-matrix displays where individual pixel control is essential for high-quality imaging.
9. The pixel circuit according to claim 1 , wherein: the pixel circuit further includes a light-emitting module comprising a light emitting switch transistor and an organic light-emitting diode as a pixel of the pixel circuit; the light-emitting switch transistor includes a first terminal being connected to a second terminal of the driving transistor, a second terminal being connected to a first terminal of the organic light-emitting diode, and a control gate terminal being connected to a light emitting control line; and a second terminal of the organic light-emitting diode is connected to a pulling-down voltage source.
This invention relates to a pixel circuit for display panels, particularly addressing the need for efficient and stable light emission control in organic light-emitting diode (OLED) displays. The pixel circuit includes a driving transistor that regulates current flow to an OLED, ensuring consistent brightness. The circuit further incorporates a light-emitting module featuring a light-emitting switch transistor and an OLED. The light-emitting switch transistor has a first terminal connected to the driving transistor's second terminal, a second terminal linked to the OLED's first terminal, and a control gate terminal connected to a light-emitting control line. This configuration allows precise control over the OLED's activation and deactivation, enhancing display performance. The OLED's second terminal is connected to a pulling-down voltage source, which stabilizes the circuit by providing a reference voltage. The light-emitting switch transistor acts as a switch, enabling or disabling current flow to the OLED based on signals from the light-emitting control line. This design improves power efficiency and reduces flicker, making it suitable for high-resolution displays. The circuit's modular structure allows integration into various display technologies, ensuring flexibility in manufacturing.
10. A pixel circuit driving method for a pixel circuit according to claim 1 , the pixel circuit driving method comprising: implementing an initialization stage; implementing a touch sensing stage; implementing a touch sensing readout stage; implementing a resetting stage; implementing a writing compensation stage; and implementing a light emitting stage.
A pixel circuit driving method is designed for active matrix organic light-emitting diode (AMOLED) displays, addressing challenges in touch sensing integration, display performance, and power efficiency. The method involves a sequence of stages to manage pixel operations while enabling touch functionality. First, an initialization stage prepares the pixel circuit by resetting voltages and currents. Next, a touch sensing stage detects touch inputs by measuring changes in capacitance or other touch-sensitive parameters. The touch sensing readout stage then processes and outputs the touch data for further analysis. A resetting stage ensures the pixel circuit is ready for the next operations by clearing residual signals. The writing compensation stage adjusts the pixel's driving current to compensate for variations in device characteristics, improving display uniformity. Finally, the light emitting stage controls the emission of light based on the compensated driving current, ensuring accurate image display. This method integrates touch sensing with display driving, enhancing user interaction while maintaining display quality and efficiency. The approach optimizes power consumption and reduces complexity by combining multiple functions in a structured sequence.
11. The pixel circuit driving method according to claim 10 , wherein implementing the initialization stage includes: charging the storage capacitor to make voltage of a first terminal of the storage capacitor be equal to a pulling-up voltage, and voltage of a second terminal of the storage capacitor be equal to a pulling-down voltage.
This invention relates to a pixel circuit driving method for organic light-emitting diode (OLED) displays, addressing issues such as threshold voltage variation and brightness inconsistency in OLED pixels. The method involves a multi-stage driving process to stabilize pixel operation. During the initialization stage, a storage capacitor is charged to establish a voltage difference between its terminals. The first terminal of the storage capacitor is set to a pulling-up voltage, while the second terminal is set to a pulling-down voltage. This voltage difference ensures proper initialization of the pixel circuit, compensating for variations in OLED threshold voltage and improving display uniformity. The method also includes subsequent stages for data writing, compensation, and emission, where the initialized voltage difference is used to adjust the driving current accurately. By precisely controlling the storage capacitor's voltage during initialization, the method enhances display performance by reducing flicker and improving brightness consistency across pixels. The technique is particularly useful in active-matrix OLED (AMOLED) displays where pixel uniformity is critical.
12. The pixel circuit driving method according to claim 10 , wherein implementing the touch sensing stage includes: changing voltage on a first terminal of the storage capacitor by the touch circuit when the touch operation happens.
This invention relates to a pixel circuit driving method for touch-sensitive displays, addressing the challenge of integrating touch sensing with display driving to improve responsiveness and accuracy. The method involves a touch sensing stage where a touch circuit detects touch operations by monitoring changes in voltage on a first terminal of a storage capacitor within the pixel circuit. The storage capacitor is part of a pixel circuit that also includes a driving transistor and a light-emitting element, such as an OLED. During the touch sensing stage, the touch circuit applies a voltage to the first terminal of the storage capacitor, and when a touch operation occurs, the resulting capacitive coupling or voltage shift is detected. This allows the display to distinguish between touched and untouched pixels, enabling precise touch localization. The method ensures that touch sensing does not interfere with display driving, maintaining image quality while providing accurate touch input. The approach is particularly useful in active-matrix OLED (AMOLED) displays where touch and display functions must coexist efficiently.
13. The pixel circuit driving method according to claim 10 , wherein implementing the touch sensing readout stage includes: reading voltage on a first terminal of the storage capacitor by the data line.
This invention relates to pixel circuit driving methods for display panels with integrated touch sensing capabilities. The problem addressed is efficiently reading touch sensing signals from a pixel circuit while minimizing interference from display operations. The method involves a touch sensing readout stage where a voltage stored on a first terminal of a storage capacitor is read by a data line. The storage capacitor holds a voltage representing touch sensing information, and reading this voltage allows the system to detect touch inputs. The pixel circuit includes a driving transistor, a switching transistor, and the storage capacitor, which work together to control the display and touch sensing functions. During the touch sensing readout stage, the switching transistor may be configured to connect the storage capacitor to the data line, enabling the voltage to be read. This approach ensures that touch sensing data is accurately captured without disrupting the display operation, improving the overall performance of touch-sensitive displays. The method is particularly useful in active-matrix organic light-emitting diode (AMOLED) displays where touch sensing and display driving must coexist efficiently.
14. The pixel circuit driving method according to claim 10 , wherein implementing the resetting stage includes: charging the storage capacitor to make voltage of a first terminal of the storage capacitor be equal to a pulling-up voltage, and voltage of a second terminal of the storage capacitor be equal to a pulling-down voltage.
This invention relates to pixel circuit driving methods for display technologies, specifically addressing the need for precise voltage control during the resetting stage of pixel circuits to improve display performance. The method involves a resetting stage where a storage capacitor within the pixel circuit is charged to establish specific voltage levels at its terminals. The first terminal of the storage capacitor is charged to a pulling-up voltage, while the second terminal is charged to a pulling-down voltage. This controlled charging ensures accurate voltage differentials across the capacitor, which is critical for stable and consistent pixel operation. The method may be part of a broader driving process that includes additional stages such as initialization, compensation, and emission, where the resetting stage prepares the pixel circuit for subsequent operations by setting initial voltage conditions. The precise voltage control during resetting helps mitigate issues like threshold voltage shifts and leakage currents, enhancing the overall reliability and image quality of the display. The invention is particularly relevant to active-matrix organic light-emitting diode (AMOLED) displays, where accurate pixel control is essential for uniform brightness and color accuracy.
15. The pixel circuit driving method according to claim 10 , wherein implementing the writing compensation stage includes: writing a data voltage into the data line; writing the data voltage into the control gate of the driving transistor to turn on the driving transistor; and charging the storage capacitor until the voltage of a second terminal of the storage capacitor is equal to a deviation between the data voltage and the threshold voltage of the control gate of the driving transistor.
This technical summary describes a method for driving a pixel circuit in a display device, specifically addressing the challenge of compensating for threshold voltage variations in driving transistors to improve display uniformity. The method involves a writing compensation stage where a data voltage is applied to a data line and then written to the control gate of a driving transistor, turning it on. The storage capacitor is charged until its second terminal reaches a voltage equal to the difference between the data voltage and the threshold voltage of the driving transistor's control gate. This compensates for threshold voltage variations by storing the deviation in the storage capacitor, ensuring consistent current flow through the driving transistor regardless of its threshold voltage. The method is part of a broader pixel circuit driving process that may include initialization, threshold voltage compensation, and emission stages, where the compensated voltage stored in the storage capacitor is used to drive an organic light-emitting diode (OLED) or similar display element. The technique enhances display performance by mitigating brightness inconsistencies caused by transistor threshold voltage variations.
16. The pixel circuit driving method according to claim 10 , wherein implementing the light emitting stage includes: emitting lights through the light emitting module driven by the driving transistor without disturbance of the threshold voltage.
This invention relates to a pixel circuit driving method for organic light-emitting diode (OLED) displays, addressing the problem of threshold voltage disturbance in driving transistors that degrades display performance. The method includes a light-emitting stage where a light-emitting module is driven by a driving transistor without interference from the threshold voltage, ensuring accurate and stable light emission. The driving transistor operates in a saturation region during this stage, allowing the current to be independent of the threshold voltage, thus preventing variations in brightness or color uniformity. The method also includes a compensation stage where the threshold voltage of the driving transistor is measured and stored in a storage capacitor, enabling precise compensation during the light-emitting stage. This compensation ensures that the driving current remains consistent regardless of variations in the driving transistor's threshold voltage, improving display quality. The technique is particularly useful in high-resolution and high-brightness OLED displays where threshold voltage fluctuations can significantly impact image fidelity. By isolating the light-emitting stage from threshold voltage effects, the method enhances display uniformity and longevity.
17. An array substrate comprising the pixel circuit according to claim 1 .
Technical Summary: This invention relates to an array substrate incorporating a pixel circuit designed for display applications. The pixel circuit includes a driving transistor, a switching transistor, and a storage capacitor. The driving transistor controls the current flow to a light-emitting element, such as an OLED, based on a data signal. The switching transistor selectively transmits the data signal to the driving transistor during a charging phase. The storage capacitor maintains the voltage level of the data signal to sustain the driving transistor's operation during the emission phase. The array substrate integrates this pixel circuit to form a display panel, where each pixel is independently controlled to produce images. The invention addresses the need for efficient, stable, and uniform pixel operation in display technologies, particularly in active-matrix organic light-emitting diode (AMOLED) displays. The pixel circuit ensures consistent brightness and reduces power consumption by maintaining precise current control through the driving transistor. The array substrate's design enhances manufacturing scalability and reliability, making it suitable for high-resolution and large-area displays. The invention focuses on improving display performance by optimizing the pixel circuit's structure and electrical characteristics.
18. A display apparatus comprising the array substrate according to claim 17 .
A display apparatus includes an array substrate with a plurality of pixel units arranged in a matrix. Each pixel unit contains a thin-film transistor (TFT) and a pixel electrode, where the TFT has a gate electrode, a source electrode, and a drain electrode. The gate electrode is connected to a gate line, the source electrode is connected to a data line, and the drain electrode is connected to the pixel electrode. The array substrate further includes a common electrode layer and a color filter layer, where the common electrode layer is positioned opposite the pixel electrode to form a storage capacitor. The display apparatus may also include a backlight module and a liquid crystal layer sandwiched between the array substrate and a color filter substrate. The TFT controls the voltage applied to the pixel electrode, which, in combination with the common electrode, modulates the alignment of liquid crystal molecules to produce an image. The design ensures efficient electrical control of each pixel, enabling high-resolution and high-contrast displays. The apparatus may be used in devices such as smartphones, televisions, or digital signage, addressing the need for compact, energy-efficient, and high-performance display technologies.
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February 11, 2020
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